It is constructed of stainless steel with ground and polished welds, and equipped with sanitary epoxy-mounted screens. Quick-disconnect clamps between each screen frame provide rapid interior access for inspection, screen changes and wash down.

The dust-tight, gravity-fed unit contains two horizontal screens located one above the other in a vertical, cylindrical housing supported on a circular base by rugged springs. An imbalanced weight gyratory motor affixed to the housing imparts vibration.

Material to be separated is fed onto the center of the top screen, whose mesh is the largest. Oversize particles are moved to the screen periphery in a spiral pathway, and discharged through an extended spout, while the balance of material passes through the screen, onto the center of the next screen. In similar manner, on-size particles are moved to the periphery of the second screen and through another extended spout, while undersize particles pass through the screen onto a chute and through the third extended discharge spout.

The unit can operate on a batch or continuous basis, and is equipped with sanitary anti-blinding ball tray assemblies under both screen decks to dislodge near-size particles from screen apertures.